TECHNICAL INFORMATION

1) METHYL BROMIDE FUMIGATION:

Methyl Bromide is almost widely used fumigant for Quarantine purposes. It is a preferred fumigant by most of the quarantine authorities through out the world, because of its good penetrating ability, rapid action, high toxicity to a broad spectrum of insects and pests. It is frequently used for fumigating timber, agricultural products, empty containers, food stuffs, and other agricultural produce.

 

When fumigated  with Methyl Bromide fumigant residue problems will not be there as aeration can be carried out easily. It is very effective in controlling all stages of insects from egg to the adult stage. Quarantine Authorities around the world have stipulated that methyl bromide fumigation has to be carried out for all the packing materials which is made out of Wood, Straw materials.

The basic properties of Methyl Bromide are as follows:

Formula

CH3 Br

 

Molecular Weight

95 g

 

Boiling Point

3.6 0 C

 

Specific Volume at 30 0 C (at 1 atm)

0,256 m3/kg

 

Specific gravity (gas) [air = 1.0]

3.40

 

Gas density at 30 0 C (at 1 atm)

3.908 kg/m3

 

Solubility in water (v/v)

3.4

 

Thresh hold limit

5 ppm (0.02 g/ m3

 

Structure:

image of mbr cans

 

 

 

 

 

Aluminium Phosphide:

Aluminium Phosphide is in the form of tablets and is packed in a flask. It is used worldwide for fumigation of raw and processed commodities including grains, tobacco, cocoa beans, nuts seeds, animal feeds, tea, coffee leaf, wheat flour, processed spices, dried fruits. It can also be used for fumigating storage

 

Phosphine:

IUPAC:

phosphine

gAS:

phosphine

Formula:

P H3

Activity:

insecticides (fumigant insecticides)

Notes:

There is no ISO common name for this substance; the name “phosphine” has been used in the literature but has no official status except as a systematic chemical name. It is normally generated from aluminium phosphide or magnesium phosphide

Structure:

Structural formula of phosphine  (or)     File:Sphalerite-unit-cell-depth-fade-3D-balls.png

 

 

 

 

 

 

Properties of phosphine:

Alternative name:

hydrogen phosphide

Odour

Carbide or garlic-like odour may be due to impurities (see text)

Chemical formula

PH3

Boiling point

-87.4°C

Freezing point

-133.5°C

Molecular weight

34.04

Specific gravity gas (air = 1)

1.214°

liquid (water at 4°C = 1)

0.746(-90)

Latent heat of vaporization

102.6 cal/g

Lowest explosion point

1.79% by volume in air

Solubility in water

26 cc/100 ml at 17°C (very slightly soluble)

Method of evolution as fumigant

From preparations of aluminium and magnesium phosphide

Pertinent chemical properties

Reacts with copper and precious metals.

Image of alp tablet

Image of AlP flask

 

 

 

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